DB_FILES

Minimum: the largest among the absolute file numbers of the datafiles in the database

Maximum: operating system-dependent

Basic

No

Real Application Clusters

You must set this parameter for every instance, and multiple instances must have the same value.

DB_FILES specifies the maximum number of database files that can be opened for this database. The maximum valid value is the maximum number of files, subject to operating system constraint, that will ever be specified for the database, including files to be added by ADD DATAFILE statements.

If you increase the value of DB_FILES, then you must shut down and restart all instances accessing the database before the new value can take effect. If you have a primary and standby database, then they should have the same value for this parameter.